remove slow covering raytracing gifs, flip fixed material stair scene screenshot

Author: AnastaZIuk

README.md

@@ -115,35 +115,8 @@ Contact ***[@devshgraphicsprogramming](https://github.com/devshgraphicsprogrammi
 
 ![](https://github.com/Devsh-Graphics-Programming/Nabla/blob/6e4842588ef02ffb619242a08c0c037bba59c244/site_media/readme/gifs/denoisingalbedoandnormals/denoising%207.gif?raw=true)
 
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-### [Raytracing flythrough](https://www.youtube.com/watch?v=bwVVoAsRjHI)
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-![](https://github.com/Devsh-Graphics-Programming/Nabla/blob/6e4842588ef02ffb619242a08c0c037bba59c244/site_media/readme/gifs/raytracingflythrough/raytracing%201.gif?raw=true)
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-![](https://github.com/Devsh-Graphics-Programming/Nabla/blob/6e4842588ef02ffb619242a08c0c037bba59c244/site_media/readme/gifs/raytracingflythrough/raytracing%202.gif?raw=true)
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-![](https://github.com/Devsh-Graphics-Programming/Nabla/blob/6e4842588ef02ffb619242a08c0c037bba59c244/site_media/readme/gifs/raytracingflythrough/raytracing%203.gif?raw=true)
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-![](https://github.com/Devsh-Graphics-Programming/Nabla/blob/6e4842588ef02ffb619242a08c0c037bba59c244/site_media/readme/gifs/raytracingflythrough/raytracing%204.gif?raw=true)
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-![](https://github.com/Devsh-Graphics-Programming/Nabla/blob/6e4842588ef02ffb619242a08c0c037bba59c244/site_media/readme/gifs/raytracingflythrough/raytracing%205.gif?raw=true)
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 ### Screenshots
 
-### Screen Shots
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 ##### <u>Pseudo Spectral rendering</u>
 
 ![](https://github.com/Devsh-Graphics-Programming/Nabla/blob/ad02c69e384c6655951c99d3b4bee5178a9dab2f/site_media/readme/screenshots/myballs/spectral%20renderering.png?raw=true)